278 H. C. FALL. 



male, acutely triangular in the female ; 4-10 strongly flabellate in 

 the male, broadly serrate in the female ; eleventh very elongate and 

 similar to the branches of the preceding joints in the male, oval, not 

 much longer than the tenth in the female. Eyes round, not large 

 but strongly convex ; front feebly margined over the antennae, quite 

 strongly impressed along the epistomal suture. Prothorax as wide 

 as the elytra, varying more or less in form in the sexes; surface 

 gran ulato- rugose in the male, distinctly asperate anteriorly in the 

 female; side margin narrow, not visible from above; front margin 

 more or less serrulate or crenulate in the female ; front angles a little 

 obtuse and well defined, hind angles rounded but somewhat defined. 

 Scutellum subquadrate and a little elevated. Elytra usually con- 

 fusedly punctate, rarely with the punctures arranged somewhat in 

 lines. The head is rather strongly defiexed and not visible from 

 above, but the prothorax is scarcely or only feebly excavated for its 

 reception; prosternum moderate in. length before the coxae, which 

 are nearly contiguous; middle coxae very narrowly separated ; meso- 

 sternum nearly horizontal ; metasternura moderately long, not de- 

 clivous in front, median line sulcate posteriorly, hind margin not 

 notched at middle; episterna wide, parallel ; hind coxal plates very 

 narrow, not distinctly dilated internally. Veutral segments 1-4 

 nearly equal in length at middle, the fifth segment longer; first 

 suture broadly posteriorly arcuate at middle. Legs moderate, front 

 tibiae finely subserrate externally, terminated by a strong horizontal 

 apical tooth; middle tibiae similarly but less conspicuously armed ; 

 tarsi as long as the tibiae, first joint, as long as the two or three fol- 

 lowing, second shorter and equal to the third and fourth united, the 

 latter short ; the fifth joint slightly elongate. 



The form in this genus is more cylindrical than usual, and rather 

 more markedly so in the female 1 ; the pubescence is very short, fine 

 and appressed. In the female the fifth ventral segment is acutely 

 transversely carinate before the apex in most species, and this struc- 

 ture is in some species more or less evident in the males. 



I have not been able to identify Randall's Tomicus thoracicus, 

 which subsequent authors have referred to this genus. The descrip 

 tiou* is very inadequate, but the " pitchy black " antennae would 



* '' Tomicus thoracicus. — Body cylindrical, a little rough, black ; antennae pitchy 

 black; thorax subglobose, indistinctly punctured; elytra punctured, hardly 

 striate, although in some lights the distribution of the punctures gives somewhat 

 that appearance ; apex entire. Length 2 3 o > n - Maine." 



